An unseasonably dynamic weather pattern was in place over the central U.S. on the 13th.  A closed upper level low pressure system lifted northeast out of the southwest U.S. and was centered over southeast South Dakota by the evening of the 13th.  A strong mid level jet of 80 kts was present at 500 Mb.  The atmosphere was unstable, but not as much as it could have been.  Surface temperatures reached the low 80s with dew point readings in the 60s for the most part.  CAPE values measured shortly before thunderstorm initiation were in the 1200 to 1500 J/kg range with lifted indices in the -4 to -7 C. range.  With the upper low moving into the area, cooling took place in the mid and upper levels of the atmosphere during the day with the freezing level dropping to under 11,000 feet over western Iowa.  The freezing level was around 12,500 over the eastern counties.  Lapse rates were around 8 C. in the 850 to 700 mb layer.  Thunderstorms formed over eastern Nebraska by the late afternoon hours.  They formed along the west edge of the dry slot, then lifted northeast across the CWA.  Although the expectation of tornadoes was there, the lifted condensation level was fairly high and limited the number of tornadoes.  Three did touch down in Marion County during the evening hours.  Two of them were in the Melcher area and touched down briefly in farm fields around town.  A third tornado touched down northeast of Knoxville in a field.  Little damage was reported.   Earlier there was another brief touchdown in open country east of Bedford in Taylor County.  The main severe weather mode with the storms was hail.  There were numerous reports of hail in the three quarter to one inch range all along the line.  One of the stronger storms dropped one and one half inch diameter hail in Polk County at Johnston.  A few of the storms produced high winds with scattered damage reported.   semi tractor-trailer truck was blown over east of Arcadia in Carroll County along U.S. Highway 30.

Hail in POLK, IOWA
From 13-JUN-05 18:26:00 to 13-JUN-05 18:26:00 (CST)
Location: ANKENY
Magnitude: 1.00 
Property damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in POLK, IOWA
From 13-JUN-05 18:30:00 to 13-JUN-05 18:30:00 (CST)
Location: ANKENY
Magnitude: 52 EG
Property damage: 2K
Reported by: NWS EMPLOYEE(OFF DUTY)

Hail in POLK, IOWA
From 13-JUN-05 18:31:00 to 13-JUN-05 18:31:00 (CST)
Location: ANKENY
Magnitude: 1.00 
Property damage: 5K
Reported by: NWS EMPLOYEE(OFF DUTY)

Hail in WARREN, IOWA
From 13-JUN-05 19:02:00 to 13-JUN-05 19:02:00 (CST)
Location: CARLISLE
Magnitude: 1.00 
Property damage: 5K
Crop damage: 2K
Reported by: TRAINED SPOTTER

Tornado in MARION, IOWA
From 13-JUN-05 19:53:00 to 13-JUN-05 19:53:00 (CST)
Location: KNOXVILLE
Tornado F-scale: F0
Reported by: STORM CHASER

Tornado made a brief touchdown in open areas northeast of Knoxville.

Hail in GREENE, IOWA
From 13-JUN-05 16:10:00 to 13-JUN-05 16:10:00 (CST)
Location: CHURDAN
Magnitude: 0.88 
Property damage: 2K
Crop damage: 5K
Reported by: GENERAL PUBLIC

Hail in EMMET, IOWA
From 13-JUN-05 16:34:00 to 13-JUN-05 16:34:00 (CST)
Location: ESTHERVILLE
Magnitude: 0.75 
Crop damage: 5K
Reported by: LAW ENFORCEMENT

Hail in WEBSTER, IOWA
From 13-JUN-05 17:00:00 to 13-JUN-05 17:00:00 (CST)
Location: GOWRIE
Magnitude: 1.00 
Property damage: 2K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in HANCOCK, IOWA
From 13-JUN-05 17:15:00 to 13-JUN-05 17:15:00 (CST)
Location: BRITT
Magnitude: 0.75 
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in BOONE, IOWA
From 13-JUN-05 17:32:00 to 13-JUN-05 17:32:00 (CST)
Location: BOONE
Magnitude: 0.55 
Property damage: 10K
Reported by: EMERGENCY MANAGER

Hail in POLK, IOWA
From 13-JUN-05 18:00:00 to 13-JUN-05 18:00:00 (CST)
Location: CLIVE
Magnitude: 1.00 
Property damage: 5K
Reported by: BROADCAST MEDIA

Hail in POLK, IOWA
From 13-JUN-05 18:05:00 to 13-JUN-05 18:05:00 (CST)
Location: URBANDALE
Magnitude: 1.00 
Property damage: 5K
Reported by: TRAINED SPOTTER

Hail in POLK, IOWA
From 13-JUN-05 18:11:00 to 13-JUN-05 18:11:00 (CST)
Location: GRIMES
Magnitude: 0.88 
Property damage: 2K
Reported by: TRAINED SPOTTER

Hail in POLK, IOWA
From 13-JUN-05 18:13:00 to 13-JUN-05 18:13:00 (CST)
Location: JOHNSTON
Magnitude: 1.00 
Property damage: 5K
Reported by: TRAINED SPOTTER

Hail in POLK, IOWA
From 13-JUN-05 18:14:00 to 13-JUN-05 18:14:00 (CST)
Location: JOHNSTON
Magnitude: 1.25 
Property damage: 10K
Reported by: BROADCAST MEDIA

Hail in POLK, IOWA
From 13-JUN-05 18:19:00 to 13-JUN-05 18:19:00 (CST)
Location: JOHNSTON
Magnitude: 1.50 
Property damage: 10K
Reported by: NWS EMPLOYEE(OFF DUTY)

Hail in POLK, IOWA
From 13-JUN-05 18:19:00 to 13-JUN-05 18:19:00 (CST)
Location: JOHNSTON
Magnitude: 0.88 
Property damage: 3K
Reported by: TRAINED SPOTTER

Hail in POLK, IOWA
From 13-JUN-05 18:22:00 to 13-JUN-05 18:22:00 (CST)
Location: ANKENY
Magnitude: 1.00 
Property damage: 3K
Reported by: NWS EMPLOYEE(OFF DUTY)

Thunderstorm Wind in POWESHIEK, IOWA
From 13-JUN-05 20:59:00 to 13-JUN-05 20:59:00 (CST)
Location: MONTEZUMA
Magnitude: 50 MG
Property damage: 1K
Reported by: AWOS,ASOS,MESONET,ETC

Thunderstorm Wind in CARROLL, IOWA
From 13-JUN-05 16:30:00 to 13-JUN-05 16:30:00 (CST)
Location: ARCADIA
Magnitude: 50 EG
Property damage: 10K
Reported by: LAW ENFORCEMENT

Tornado in TAYLOR, IOWA
From 13-JUN-05 17:50:00 to 13-JUN-05 17:50:00 (CST)
Location: BEDFORD
Tornado F-scale: F0
Crop damage: 1K
Reported by: GENERAL PUBLIC

Tornado touched down briefly in farm fields.

Hail in DALLAS, IOWA
From 13-JUN-05 18:00:00 to 13-JUN-05 18:00:00 (CST)
Location: WAUKEE
Magnitude: 0.88 
Property damage: 1K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in WARREN, IOWA
From 13-JUN-05 19:15:00 to 13-JUN-05 19:15:00 (CST)
Location: MILO
Magnitude: 52 EG
Property damage: 2K
Reported by: LAW ENFORCEMENT

Tornado in MARION, IOWA
From 13-JUN-05 19:30:00 to 13-JUN-05 19:30:00 (CST)
Location: MELCHER
Tornado F-scale: F0
Crop damage: 1K
Reported by: BROADCAST MEDIA

Tornado touched down briefly in open fields west of Melcher.

Tornado in MARION, IOWA
From 13-JUN-05 19:47:00 to 13-JUN-05 19:47:00 (CST)
Location: MELCHER
Tornado F-scale: F0
Crop damage: 1K
Reported by: LAW ENFORCEMENT

Tornado touched down briefly in fields northeast of Melcher.

Thunderstorm Wind in POWESHIEK, IOWA
From 13-JUN-05 20:53:00 to 13-JUN-05 20:53:00 (CST)
Location: MONTEZUMA
Magnitude: 50 EG
Property damage: 2K
Reported by: LAW ENFORCEMENT